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<DIV dir=ltr align=left><SPAN class=125391817-18082008><FONT face=Arial
color=#0000ff size=2>Dear Vikram,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=125391817-18082008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=125391817-18082008><FONT face=Arial
color=#0000ff size=2>Although I know nothing about GC equipment, physics
mandates that all energy which goes into almost all mechanical / electrical
devices becomes heat. Your job is to a) figure out whether the heat ends
up in the conditioned space or elsewhere and b) figure out what the effective
load diversity is for your particular piece of equipment. (almost nothing
operates 100% of the time at 100% of its maximum energy.)</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=125391817-18082008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=125391817-18082008><FONT face=Arial
color=#0000ff size=2>Forgive me if I'm too elementary here with a
couple simple examples:</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=125391817-18082008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=125391817-18082008><FONT face=Arial
color=#0000ff size=2>1) An exhaust fan motor imparts a certain amount of
energy (its work energy) to the exhaust air. If the air ends up outdoors,
that energy does not affect the AC load. In addition, the motor itself may
be in the exhaust airstream or outside it. If it's in the airstream, the
~10% motor inefficiency also ends up in the exhaust airstream. If the
motor is outside the exhaust airstream, the ~10% ends up wherever the motor is
located.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=125391817-18082008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=125391817-18082008><FONT face=Arial
color=#0000ff size=2>2) Similarly, an air handler fan motor imparts its work
energy to the airstream and therefore always becomes part of the AC
load. The motor inefficiency, depending on the motor placement, may become
part of the AC load (or not).</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=125391817-18082008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=125391817-18082008><FONT face=Arial
color=#0000ff size=2>A fine point in this consideration is that belt-driven
motors always lose ~6-7% via the transmission (belt) system. Most people
forget about this.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=125391817-18082008></SPAN><SPAN
class=125391817-18082008><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=125391817-18082008><FONT face=Arial
color=#0000ff size=2>I suspect that your GC equipment will dissipate all of its
energy into the space it occupies unless, for example, it is water-cooled, in
which case the water cooling system will remove some of the heat from the space
in which it is located.</FONT></SPAN></DIV>
<DIV> </DIV>
<DIV class=Section1>
<P class=MsoNormal style="TEXT-ALIGN: center" align=center><B
style="mso-bidi-font-weight: normal"><FONT size=4>The Building Performance
Team<BR></FONT></B><B style="mso-bidi-font-weight: normal">James V. Dirkes II,
P.E., LEED AP<BR></B>1631 Acacia Drive NW<BR>Grand Rapids, MI 49504<BR>616
450 8653<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P></DIV>
<DIV> </DIV><BR>
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<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <B>On Behalf Of </B>Vikram
Sami<BR><B>Sent:</B> Monday, August 18, 2008 1:04 PM<BR><B>To:</B>
bldg-sim@lists.onebuilding.org<BR><B>Subject:</B> [Bldg-sim] CFD modeling for
lab buildings<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=Section1>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">I’m
curious if there are any published papers on CFD modeling of lab equipment. I’m
particularly interested in gas chromatographers. We are working on a lab
building with GCs and I would like to see what portion of their considerable
heat output is actually seen by the chillers. <o:p></o:p></SPAN></P>
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style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<DIV>
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Sami,</SPAN></B><SPAN style="COLOR: #1f497d"> </SPAN><SPAN
style="COLOR: black; FONT-FAMILY: 'Garamond','serif'">LEED AP</SPAN><SPAN
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